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2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)最新文献

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A numerical and experimental study of the remote long-period grating fiber sensor with Raman Amplification 远距离拉曼放大长周期光栅光纤传感器的数值与实验研究
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369123
Thiago V. N. Coelho, M. J. Pontes, J. L. Santos, A. D. dos Santos, Daniel D. Silveira, Vinicius N. H. Silva, A. P. Lopez Barbero, F. Delgado, Presley X. Neto
In this paper, we analyze numerically and experimentally a remote optical sensor system based on Raman Amplification, composed by one long period grating operating as a sensor head separated by 50 km from the optical source and the interrogation unit composed by two fiber Bragg gratings. Since the active components of the system and the sensor head are separated over such a large distance, it is necessary to consider optical amplification to strengthen the optical signal. The use of Raman amplification allows reaching the desirable gain bandwidth by changing the pump lasers parameters such as the power, number of pumps and spectral position. We present the obtained measurement results of the environmental temperature for two different setups that was analyzed a priori by the numerical model. We show that the power ratio between the two central wavelengths of the FBG has a linear relation with the change of LPG resonance with temperature.
本文对一种基于拉曼放大的远程光学传感器系统进行了数值和实验分析,该系统由一个长周期光栅作为传感器头,与光源相距50 km,由两个光纤布拉格光栅组成的询问单元组成。由于系统的有源元件与传感器头的距离较远,因此需要考虑光放大来增强光信号。利用拉曼放大可以通过改变泵浦激光器的参数(如功率、泵浦数量和光谱位置)来达到理想的增益带宽。本文给出了两种不同装置的环境温度测量结果,并通过数值模型进行了先验分析。结果表明,光纤光栅两个中心波长之间的功率比与LPG共振随温度的变化呈线性关系。
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引用次数: 3
Numerical analysis of microwave excitations in multiferroic layered structures 多铁层状结构中微波激励的数值分析
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369049
V. V. Vitko, A. Ustinov, A. Semenov, B. Kalinikos, A. A. Nikitin, A. Nikitin, E. Lahderanta
We present a theory of quasi surface spin-electromagnetic waves (SEW) spectrum in structure consisting of multiple ferrite and dielectric layers. Developed theory takes into account interactions between spin waves in the different ferrite layers and electromagnetic waves. It was shown that SEW spectra in the ferrite-ferroelectric structure based on two ferrite films and one ferroelectric layer are formed by several hybridizations. It was found that electric tuning of SEW in these structures is still possible in case of thin ferroelectric film due to spin wave interaction.
提出了由多层铁氧体和介电层组成的结构中的准表面自旋电磁波谱理论。发达的理论考虑了不同铁氧体层中自旋波与电磁波之间的相互作用。结果表明,基于两层铁氧体膜和一层铁电层的铁氧体-铁电结构中的SEW光谱是由多次杂化形成的。发现在铁电薄膜中,由于自旋波的相互作用,在这些结构中仍然可以实现SEW的电调谐。
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引用次数: 0
On the propagation of diffraction resistant beams of the Frozen Wave-type through two dielectric media 冻结波型抗衍射光束在两种介质中的传播
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369040
Grazielle de Araujo Lourenco Rodrigues, M. Zamboni-Rached
In this paper we study the propagation of diffraction resistant beams of the type Frozen Wave through two different dielectric media separated by a plane interface. We use a scalar model, assuming that the field (scalar) is a transversal cartesian component of the linear polarized electromagnetic beam.
本文研究了冻结波型抗衍射光束在两种被平面界面隔开的介质中的传播。我们使用标量模型,假设场(标量)是线性极化电磁波束的横向笛卡尔分量。
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引用次数: 1
Digital back-propagation ASIC design for high-speed coherent optical system 高速相干光学系统的数字反向传播ASIC设计
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369081
S. Ranzini, V. E. Parahyba, T. Vilela, E. Schneider, Joao B. Tardelli, Julio Oliveira, Eudes P. Lopes, Tiago C. Lima, J. Reis, J. Oliveira, G. Fraidenraich
We analyze the performance limits of the digital back-propagation (DBP) algorithm implemented in application specific integrated circuits (ASIC). The proposed hardware implementation, jointly with a set of other digital signal processing (DSP) blocks, was experimentally evaluated by processing a 32 GBd PDM-16QAM signal. In the transmitter side, it is discussed the linear filters complexity for Nyquist spectral shaping and the trade-off between number of taps and filter roll-off. Then, at the receiver, linear filters and nonlinear compensators are used to equalize chromatic dispersion (CD) and nonlinear distortions, respectively. These stages characterize the DBP block, which is able to enhance the transmission reach and the optimum launch power of the optical system. Transmission performance is optimized for different DBP implementations, considering two CMOS technology nodes: 16 nm and 28 nm. The DBP complexity is evaluated in terms of the required die size and in terms of number of the DBP stages and fiber span-lengths. For a target gain of 35% (in comparison with the CD-only compensation) on the transmission reach, the required DBP chip size is around 1.6 mm x 1.6 mm using 16 nm CMOS technology. The chip area of the nonlinear stage is only 16% larger than the linear stage.
我们分析了在专用集成电路(ASIC)中实现的数字反向传播(DBP)算法的性能限制。通过对32gbd PDM-16QAM信号的处理,对所提出的硬件实现以及其他数字信号处理(DSP)模块进行了实验评估。在发射端,讨论了奈奎斯特频谱整形的线性滤波器复杂度以及抽头数和滤波器滚降之间的权衡。然后,在接收端,使用线性滤波器和非线性补偿器分别平衡色散和非线性畸变。这些阶段是DBP块的特征,它能够提高光学系统的传输距离和最佳发射功率。考虑到16纳米和28纳米两种CMOS技术节点,针对不同的DBP实现优化了传输性能。DBP复杂性是根据所需的模具尺寸和DBP阶段的数量和光纤的长度来评估的。为了在传输距离上获得35%的目标增益(与纯cd补偿相比),使用16nm CMOS技术所需的DBP芯片尺寸约为1.6 mm x 1.6 mm。非线性级的芯片面积仅比线性级大16%。
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引用次数: 4
Synthesis of the radiation pattern of retrodirective antenna arrays using the Particle Swarm Optimization algorithm 基于粒子群优化算法的反向定向天线阵辐射方向图综合
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369119
M. P. Magalhães, Alian M. Engroff, L. S. Pereira, M. Heckler, A. Girardi
This paper presents a study of radiation pattern synthesis for retrodirective arrays for mobile communication services in a scenario using high altitude platforms (HAPs). For this purpose, a dual-band and dual-polarization microstrip antenna array has been designed, whereby the array should receive the signal in one band and resend it in the other operating band. The radiation pattern in the receiving mode has been synthesized with the Particle Swarm Optimization (PSO) algorithm, which allowed steering the main beam and controlling the side lobe level. In order to assess the performance for practical implementation, a study on the impact of the magnitude discretization due to the use of digitally controlled variable-gain amplifiers on the radiation properties of the array in receiving mode was carried out. The results show that the performance is slightly affected by limitations on the RF circuitry for practical implementation.
本文介绍了在高空平台(HAPs)场景下用于移动通信服务的反向定向阵列的辐射方向图综合研究。为此,设计了一种双频双极化微带天线阵列,该阵列在一个频段接收信号,在另一个工作频段重发信号。采用粒子群优化(PSO)算法合成了接收模式下的辐射方向图,实现了对主波束的控制和对副瓣电平的控制。为了评估实际实现的性能,研究了由于使用数控变增益放大器而导致的幅度离散对阵列在接收模式下的辐射特性的影响。结果表明,在实际实现中,射频电路的限制对性能的影响很小。
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引用次数: 2
UHF signal measurements and prediction using propagation models 超高频信号的测量和预测使用传播模型
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369202
K. S. Almeida, R.A.T. Santos, Edgar Silva, C. C. Cardoso, Ivonete M. L. Oliveira
This paper presents a radio propagation measurement campaign of the received power in a campus scenario at State University of Feira de Santana (UEFS) and Imigrantes Highway. Comparisons and an analysis between the obtained values during the measurements at UEFS and the following propagation models: Free Space, Two-Ray, Log-Distance and Two-Ray without approximations are presented. The measurements taken at Imigrantes Highway are also compared to Two-Ray model without approximations.
本文介绍了费拉德桑塔纳州立大学(UEFS)和移民高速公路校园场景中接收功率的无线电传播测量活动。比较和分析了在UEFS中测量得到的值与以下几种传播模型:自由空间、双射线、对数距离和无近似的双射线。在移民高速公路上的测量也与没有近似值的双射线模型进行了比较。
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引用次数: 3
Constitutive parameters determination of bi-anisotropic metamaterials using a waveguide method 用波导法测定双各向异性超材料的本构参数
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369109
U. Hasar, M. Bute, A. Muratoglu, J. Barroso, T. Karacali, M. Ertuğrul
A retrieval method is proposed for determination of electromagnetic properties of bi-anisotropic metamaterial (MM) slabs inserted in a waveguide. For this goal, forward and backward reflection and transmission scattering (S-) parameters of a configuration where the slab is positioned into a waveguide are first derived and then a procedure for extraction of electromagnetic properties of this slab is presented. We performed full-wave electromagnetic simulations on the bi-anisotropic MM slab with split-ring-resonators to validate the proposed method.
提出了一种测量插入波导中的双各向异性超材料(MM)板电磁特性的检索方法。为此,首先推导了平板放置在波导中的前向、后向反射和透射散射(S-)参数,然后给出了平板电磁特性的提取方法。我们在双各向异性MM板上用裂环谐振器进行了全波电磁仿真来验证所提出的方法。
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引用次数: 2
Vibration measurement of Induction Motor under dynamic eccentricity using optical fiber Bragg grating sensors 用光纤光栅传感器测量感应电机在动态偏心下的振动
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369059
Kleiton de Morais Sousa, U. Dreyer, C. Martelli, J. C. Cardozo da Silva
The vibration in Three-Phase Induction Motors (TIM) is due to mechanical and electrical forces existing during the motor operation. Vibration problems in induction motors can be extremely frustrating and may lead to greatly reduced reliability increasing the maintenance cost. The vibration was measured using fiber Bragg gratings (FBG) installed inside the motor between two stator teeth. The vibration frequencies in TIM are predicted using a model of the forces present in the air gap considering a static and dynamic rotor eccentricity. Two FBGs were positioned between two stator teeth, separated by 120° from each other. The analysis of the vibration spectrum at 60 Hz motor power supply presents the frequencies 60 Hz, 120 Hz, 180 Hz and 240 Hz. This combination of the mechanical and electrical frequencies continue to appear even when the motor electrical supply frequency is reduced by half. The measurement present in this paper can be used to determine some TIM parameters, like the effect of the motor power supply on its vibration signal and also be used like a potential maintenance tool for predictive purposes with high efficiency to continuously monitor the TIM.
三相感应电动机(TIM)的振动是由于电动机运行过程中存在的机械力和电磁力引起的。振动问题在感应电机可以是非常令人沮丧的,并可能导致大大降低可靠性,增加维护成本。利用安装在电机内部两个定子齿之间的光纤布拉格光栅(FBG)测量振动。考虑转子的静态和动态偏心,利用气隙中存在的力模型预测了TIM的振动频率。两个fbg被放置在两个定子齿之间,彼此相隔120°。分析了60hz电机电源的振动频谱,给出了60hz、120hz、180hz和240hz的频率。即使电机供电频率降低一半,机械和电气频率的这种组合也会继续出现。本文提出的测量方法可以用来确定一些TIM参数,如电机电源对其振动信号的影响,也可以作为一种潜在的维护工具,用于预测目的,高效地连续监测TIM。
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引用次数: 7
A new concept of microstrip Rotman lens design 一种微带罗特曼透镜设计的新概念
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369130
Ilidio L. Ferreira Filho, M. Mosso
This paper presents a methodology for design a more reliable printed microstrip Rotman lens with the support of electromagnetic simulation software. A lens with four beam ports and four array ports in the range of 4 to 6 GHz is developed and manufactured with simulated and measured results of reflection coefficient, isolation and radiation pattern, showing a good performance of this methodology.
本文提出了一种在电磁仿真软件的支持下设计更可靠的印刷微带罗特曼透镜的方法。研制了4 ~ 6 GHz范围内的4束口和4阵口透镜,并对反射系数、隔离度和辐射方向图进行了仿真和测量,结果表明该方法具有良好的性能。
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引用次数: 4
Signal-flow graph analysis in PLC multipath model PLC多路径模型中的信号流图分析
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369222
U. R. C. Victor, F. Sabino, G. Machado, M. T. de Melo, B. D. de Oliveira, M. Segatto
The transfer function of electrical power lines for Broadband Power Line Communication (BPLC) is investigated through a signal-flow graph analysis. The work intends to present a new, simple and didactic way to model the transfer function of a multi-path model, in which the attenuation losses are taken into account. The results are compared to the transfer function obtained by the ABCD model. Measurements on coax cables and electrical grids are presented and the results are investigated.
通过信号流图分析,研究了宽带电力线通信中电力线的传递函数。这项工作旨在提出一种新的、简单的、说教式的方法来模拟多路径模型的传递函数,其中考虑了衰减损失。结果与ABCD模型得到的传递函数进行了比较。给出了同轴电缆和电网的测量结果,并对结果进行了分析。
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引用次数: 0
期刊
2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)
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